Add Dashing gpu effect for simple dashed lines

include/gpu/SkGpuDevice.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 201 matching lines @@
                             bool needsTextureDomain);
     void drawTiledBitmap(const SkBitmap& bitmap,
                          const SkRect& srcRect,
                          const SkIRect& clippedSrcRect,
                          const GrTextureParams& params,
                          const SkPaint& paint,
                          SkCanvas::DrawBitmapRectFlags flags,
                          int tileSize,
                          bool bicubic);
 
+    bool drawDashLine(const SkPoint pts[2], const SkPaint& paint);
+
     static SkPicture::AccelData::Key ComputeAccelDataKey();
 
     typedef SkBitmapDevice INHERITED;
 };
 
 #endif